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Search Results: 1 - 10 of 191349 matches for " D. Vivolo "
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The mondromy of the Lagrange Top and the Picard-Lefschetz formula
O. Vivolo
Physics , 2001,
Abstract: The purpose of this paper is to show that the monodromy of action variables of the Lagrange top and its generalizations can be deduced from the monodromy of cycles on a suitable hyperelliptic curve (computed by the Picard-Lefschetz formula).
Gamma Ray Bursts Scaling Relations to test cosmological models
S. Capozziello,L. Consiglio,M. De Laurentis,G. De Rosa,C. Perna,D. Vivolo
Physics , 2012,
Abstract: Gamma ray burst (GRBs) can be used to constrain cosmological parameters from medium up to very high redshift. These powerful systems could be the further reliable distance indicators after SNeIa supernovae. We consider GRBs samples to achieve the luminosity distance to redshift relation and derive the values of the cosmographic parameters considering several possible scaling relations. GRBs, if calibrated by SNeIa, seem reliable as distance indicators and give cosmographic parameters in good agreement with the LCDM model. GRBs correlations with neutrino and gravitational wave signals are also investigated in view of high energy neutrino experiments and gravitational wave detectors as LIGO-VIRGO. A discussion on the GRB afterglow curve up to the visible and radio wavelengths is developed considering the possibility to use the Square Kilometer Array (SKA) telescope to achieve the first GRB-radio survey.
A new generation photodetector for astroparticle physics: the VSiPMT
G. Barbarino,F. C. T. Barbato,L. Campajola,F. Canfora,R. de Asmundis,G. De Rosa,G. Fiorillo,P. Migliozzi,C. M. Mollo,B. Rossi,D. Vivolo
Physics , 2014, DOI: 10.1016/j.astropartphys.2015.01.003
Abstract: The VSiPMT (Vacuum Silicon PhotoMultiplier Tube) is an innovative design we proposed for a revolutionary photon detector. The main idea is to replace the classical dynode chain of a PMT with a SiPM (G-APD), the latter acting as an electron detector and amplifier. The aim is to match the large sensitive area of a photocathode with the performance of the SiPM technology. The VSiPMT has many attractive features. In particular, a low power consumption and an excellent photon counting capability. To prove the feasibility of the idea we first tested the performance of a special non-windowed SiPM by Hamamatsu (MPPC) as electron detector and current amplifier. Thanks to this result Hamamatsu realized two VSiPMT industrial prototypes. In this work, we present the results of a full characterization of the VSiPMT prototype.
Preliminary Tests of a Kerma-Area Product (KAP) Meter to Be Used as a Monitor Chamber in a Conventional Diagnostic X Ray System  [PDF]
Eduardo Correa, Regina Medeiros, Maria da Penha Potiens, Vitor Vivolo, Nathalia Costa, Camila Murata, Cristina Kikuti
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.64052
Abstract: This study presents the results of the preliminary tests performed using a kerma-area product (KAP) meter in order to verify its usefulness as a monitor chamber in a clinical X ray system, which will be used in ionization chambers’ quality control program. The tests performed were repeatability, surface measurement uniformity, linearity with tube current, measurement variation changing the distance and field size, KAP chamber radiation attenuation, and energy dependence. The KAP meter has presented a good repeatability (a maximum variation of 0.4%); its surface has a homogeneous response (a maximum variation of 1.0% among the different irradiated regions); the response is linear with the tube current and the variation of the PKA along the distance is less than 3.43%. On the other hand, the results obtained for chamber attenuation and energy dependence show that some corrections must be applied when the measurements are made. The results have shown a good performance of the KAP meter, confirming that it is possible to use this instrument as a monitor chamber. However, it is important to highlight that some correction factors for energy dependence and chamber radiation attenuation must be considered.
Differential Fault Analysis on A.E.S
P. Dusart,G. Letourneux,O. Vivolo
Computer Science , 2003,
Abstract: We explain how a differential fault analysis (DFA) works on AES 128, 192 or 256 bits.
Educa??o em diabetes: papel e resultados das col?nias de férias
Vivolo, Marco Antonio;Oliveira, Odete de;Ferreira, Sandra R. G.;
Arquivos Brasileiros de Endocrinologia & Metabologia , 1998, DOI: 10.1590/S0004-27301998000600006
Abstract: improving diabetes care is essential to preserve quality of life and longevity. the achievement of this goal depends on the diabetes education. different health care centers have developed diabetes programmes based on regional characteristics and availability of resources. our experience with educational summer camp (sc) for type 1 diabetic subjects is presented. the unifesp-adj sc aims to promote diabetes education at leisure with the participation of a multiprofessional team who has the opportunity to improve knowledge and skills in diabetes management. seven-hundred-ninety subjects participated in 18 camps. the 9-day camp programme included adequate diet and exercise 3 times a day. capillary glucose is monitored with appropriate insulin closes adjustments. the same questionnaire is applied at the beginning and end of the camping period in order to evaluate knowledge improvement in diabetes; they are invited to participate in educational daily meetings. also the multiprofessional team meets every night for cases discussion. anthropometric measurements, blood pressure, urine an blood samples are obtained. individual recordings are provided to the respective families and physicians at the end of the camping period. the scs have allowed diabetic subjects to recognize the possibility of a normal life. improvement of knowledge in diabetes was confirmed by the comparison of questionnaires scores. they experienced the benefits of an adequate diet associated with exercise for glucose control and understood its importance to prevent long-term complications. hypoglycemia occured more frequently, but they learned how to identify symptoms and to treat them. blood pressure, plasma glucose and lipoproteins levels were reduced. the multiprofessional team recognized the role of diabetes education and developed skills to improve effectiveness of diabetes care. the complexity of diabetes treatment required the participation of the patient and its family in order to achieve metaboli
Prevalencia de infección por citomegalovirus en pacientes pediátricos con afecciones neurológicas en el estado Zulia, Venezuela (2007-2008) Prevalence of cytomegalovirus infection in pediatric patients with neurological disorders in Zulia state, Venezuela (2007-2008)
María Vivolo,Anyelo Durán,Luisaima Atacho,Leticia Porto
Investigación Clínica , 2012,
Abstract: El objetivo de este estudio fue determinar la prevalencia de citomegalovirus en pacientes pediátricos con afecciones neurológicas, provenientes del Estado Zulia, Venezuela durante el período 2007-2008. Se recolectaron 186 muestras pareadas de líquido cefalorraquídeo (LCR) y suero, de pacientes entre 1 mes y 14 a os de edad, que presentaron sintomatología clínica sugestiva de afectación del SNC y cuyo estudio bacteriológico convencional de LCR resultó negativo. Se determinó la relación albúmina LCR/suero a fin de descartar contaminación y a los pares óptimos se les determinó por la técnica de ELISA anticuerpos IgM e IgG en suero e IgG en LCR anti-CMV. Del total de muestras recolectadas 40,86% (76/186) resultaron óptimas para el análisis. De los 76 casos analizados, el 2,6% (2/76) de las muestras de suero resultaron positivas para IgM; 93,4% (71/76) fueron seropositivas a IgG mientras que el 31,6% (24/76) de las muestras de LCR presentaron anticuerpos IgG. En cuanto a los parámetros citoquímicos del LCR, se observaron valores de glucosa aumentados en el 58,3% (p<0,05) de los pacientes con CMV que presentaron meningoencefalitis. En los pacientes con meningitis que presentaron positividad de anticuerpos IgG anti-CMV en el LCR se observó un aumento significativo (p<0,01) en las proteínas del LCR. Se evidencia que una proporción de los pacientes pediátricos con afecciones neurológicas presentaron infección aguda por CMV, lo que demuestra una participación importante de este agente en pacientes del estado Zulia, Venezuela para el período en estudio The aim of this study was to determine the prevalence of cytomegalovirus (CMV) in pediatric patients with neurological disorders from Zulia State, Venezuela, during the period 2007-2008. Samples of cerebrospinal fluid (CSF) and serum were obtained from 186 patients with neurological symptoms and bacteriological negative CSF. The albumin CSF/serum content was determined to rule out contamination of CSF and optimal pairs were determined by ELISA of IgM and IgG anti-CMV antibodies in serum and IgG in CSF. Only 40.86% (76/186) of patients were optimal for this study. Serum samples positive for IgM antibodies (2/76; 2.6%) and IgG antibodies (71/76; 93.4%) were obtained. CSF IgG antibodies were observed in 24/76 patients (31.6%). Increased values of glucose in CSF (p<0.05) were observed in 58.3% of CMV patients with meningoencephalitis. In addition, increased CSF protein concentration (p<0.01) was observed in CSF anti-CMV antibodies positive patients with meningitis. This study shows high prevalence of acute CMV infection
Prevalencia de infección por citomegalovirus en pacientes pediátricos con afecciones neurológicas en el estado Zulia, Venezuela (2007-2008)
Vivolo,María; Durán,Anyelo; Atacho,Luisaima; Porto,Leticia; Bermúdez,John; Valero,Nereida;
Investigación Clínica , 2012,
Abstract: the aim of this study was to determine the prevalence of cytomegalovirus (cmv) in pediatric patients with neurological disorders from zulia state, venezuela, during the period 2007-2008. samples of cerebrospinal fluid (csf) and serum were obtained from 186 patients with neurological symptoms and bacteriological negative csf. the albumin csf/serum content was determined to rule out contamination of csf and optimal pairs were determined by elisa of igm and igg anti-cmv antibodies in serum and igg in csf. only 40.86% (76/186) of patients were optimal for this study. serum samples positive for igm antibodies (2/76; 2.6%) and igg antibodies (71/76; 93.4%) were obtained. csf igg antibodies were observed in 24/76 patients (31.6%). increased values of glucose in csf (p<0.05) were observed in 58.3% of cmv patients with meningoencephalitis. in addition, increased csf protein concentration (p<0.01) was observed in csf anti-cmv antibodies positive patients with meningitis. this study shows high prevalence of acute cmv infection in pediatric patients with neurological affections suggesting an important role of this virus in this pathology during the studied period
Difficult-to-control asthma management through the use of a specific protocol
Giavina-Bianchi, Pedro;Aun, Marcelo Vivolo;Bisaccioni, Carla;Agondi, Rosana;Kalil, Jorge;
Clinics , 2010, DOI: 10.1590/S1807-59322010000900014
Abstract: the present study is a critical review of difficult-to-control asthma, highlighting the characteristics and severity of the disease. it also presents a protocol for the management of patients with this asthma phenotype. the protocol, which was based on relevant studies in the literature, is described and analyzed.
Comorbidities in severe asthma: frequency of rhinitis, nasal polyposis, gastroesophageal reflux disease, vocal cord dysfunction and bronchiectasis
Bisaccioni, Carla;Aun, Marcelo Vivolo;Cajuela, Edcarlos;Kalil, Jorge;Agondi, Rosana Camara;Giavina-Bianchi, Pedro;
Clinics , 2009, DOI: 10.1590/S1807-59322009000800010
Abstract: objectives: severe asthma is found in approximately 10% of patients with asthma. some factors associated with worse asthma control include rhinitis, gastroesophageal reflux disease, vocal cord dysfunction (vcd), nasal polyposis and bronchiectasis. therefore, we evaluated the prevalence of these illnesses in patients with severe asthma. methods: we conducted a retrospective analysis of data obtained from electronic medical records of patients with severe asthma between january 2006 and june 2008. symptoms of rhinitis and gastroesophageal reflux disease were evaluated as well as intolerance to nonsteroidal anti-inflammatory drugs. we evaluated the results of esophagogastroduodenoscopy, videolaryngoscopy and ct scans of the chest in order to confirm gastroesophageal reflux disease, nasal polyposis, vocal cord dysfunction and bronchiectasis. results: we evaluated 245 patients. rhinitis symptoms were present in 224 patients (91.4%); 18 (7.3%) had intolerance to nonsteroidal anti-inflammatory drugs, and 8 (3.3%) had nasal polyposis. symptoms of gastroesophageal reflux disease were reported for 173 (70.6%) patients, although the diagnosis of gastroesophageal reflux disease was confirmed based on esophagogastroduodenoscopy or laryngoscopy findings in just 58 (33.6%) patients. vocal cord dysfunction was suspected in 16 (6.5%) and confirmed through laryngoscopy in 4 (1.6%). the patient records provided ct scans of the chest for 105 patients, and 26 (24.8%) showed bronchiectasis. discussion: rhinitis and gastroesophageal reflux disease were the most common comorbidities observed, in addition to bronchiectasis. therefore, in patients with severe asthma, associated diseases should be investigated as the cause of respiratory symptoms and uncontrolled asthma.
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